<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>作业3.1</title>
</head>
<body>
    <form method="post" action="">
        <caption>如有账号,请登录</caption>
        <p>
            <input name="username" type="text" placeholder="邮箱/手机号/QQ号">
        </p>
        <p>
            <input name="psd" type="password" placeholder="密码">
        </p>
        <p>
            <input name="ma" type="text" placeholder="验证码"><img src=""><span>换一张</span>
        </p>
        <p>
            <button type="submit">登录</button>
        </p>
    </form>
</body>
</html>